From 24a0df63c1844c6f2c69f9644a3059d668fd1e6f Mon Sep 17 00:00:00 2001
From: Pierre-Marie Pédrot <pierre-marie.pedrot@inria.fr>
Date: Sat, 7 Jun 2014 00:28:29 +0200
Subject: Adding a new Control file centralizing the control options of Coq.

---
 lib/control.ml | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 lib/control.ml

(limited to 'lib/control.ml')

diff --git a/lib/control.ml b/lib/control.ml
new file mode 100644
index 000000000..9573614fd
--- /dev/null
+++ b/lib/control.ml
@@ -0,0 +1,40 @@
+(************************************************************************)
+(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
+(* <O___,, *   INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2012     *)
+(*   \VV/  **************************************************************)
+(*    //   *      This file is distributed under the terms of the       *)
+(*         *       GNU Lesser General Public License Version 2.1        *)
+(************************************************************************)
+
+(*s interruption *)
+
+let interrupt = ref false
+
+let check_for_interrupt () =
+  if !interrupt then begin interrupt := false; raise Sys.Break end
+
+(** This function does not work on windows, sigh... *)
+let unix_timeout n f e =
+  let timeout_handler _ = raise e in
+  let psh = Sys.signal Sys.sigalrm (Sys.Signal_handle timeout_handler) in
+  let _ = Unix.alarm n in
+  let restore_timeout () =
+    let _ = Unix.alarm 0 in
+    Sys.set_signal Sys.sigalrm psh
+  in
+  try
+    let res = f () in
+    restore_timeout ();
+    res
+  with e ->
+    let e = Backtrace.add_backtrace e in
+    restore_timeout ();
+    raise e
+
+type timeout = { timeout : 'a. int -> (unit -> 'a) -> exn -> 'a }
+
+let timeout_fun = ref { timeout = unix_timeout }
+
+let set_timeout f = timeout_fun := f
+
+let timeout n f e = !timeout_fun.timeout n f e
-- 
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